Genuine BMW Engine Timing Chain Tensioner - 13528515671. Genuine BMW Engine Timing Chain Tensioner is designed to maintain proper tension in the timing chain to ensure smooth and efficient engine operation. It is a direct replacement part for the BMW 13528515671 engine timing chain tensioner. This tensioner is made from high-quality materials for long-lasting durability and performance. It is easy to install and comes with all necessary hardware for a hassle-free installation.